York Furnace Error Code E2: Pressure Switch Fault Causes and Fix

York Furnace Error Code E2: What It Means

York furnace error code E2 means the furnace detected a pressure switch fault — either the pressure switch did not close when the inducer motor started, or it opened unexpectedly during a heating cycle. The furnace shuts down as a safety measure to prevent operating without confirmed draft.

York is owned by Bosch and holds roughly 16% of the US residential HVAC market. The same control board used in York furnaces also appears in Coleman and Luxaire furnaces sold under different brand names, so E2 applies to all three.

The pressure switch is a safety device that verifies the inducer motor is creating enough negative pressure to pull flue gases out of the heat exchanger. If the switch stays open, the furnace will not light the burner. This is the same underlying fault as Carrier error code 31 and Goodman 3 flash — the brand differs but the root cause list is nearly identical.

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Common Causes

Blocked condensate drain or drain line. On 90%+ efficiency condensing furnaces, water from the drain can back up into the pressure switch hose and block the port, holding the switch open.
Cracked or disconnected pressure switch hose. The small rubber tube between the inducer housing and the pressure switch can crack, collapse, or pull loose — causing a false open reading.
Failed inducer motor. If the inducer is running slowly, seized, or not running at all, it will not create enough negative pressure to close the switch.
Failed pressure switch. The diaphragm inside the switch can rupture or the contacts can fail, causing a stuck-open condition even with correct pressure.
Blocked flue or exhaust pipe. Bird nests, ice, leaves, or debris blocking the PVC vent pipe prevent proper draft. The switch stays open because there is no airflow.
Cracked heat exchanger. A cracked heat exchanger can disrupt the pressure differential across the switch. This is the serious cause — if confirmed, the furnace must be taken out of service.

Step-by-Step Diagnosis {#fix}

Turn off the furnace and let it sit for 5 minutes. Some E2 faults are nuisance trips from a momentary pressure event. A clean restart rules that out quickly.
Inspect the pressure switch hose. Locate the small rubber tube running from the inducer housing to the pressure switch. Check for cracks, kinks, or disconnections. Remove the hose and blow through it — it should be clear with no water inside.
Check the condensate drain. Follow the white PVC drain line from the collector box to the floor drain or condensate pump. Look for standing water, blockages, or a full condensate trap. A blocked drain is the most common E2 cause on high-efficiency York furnaces.
Listen to the inducer motor at startup. The inducer should spin up immediately when the furnace calls for heat. If it hums without spinning, spins slowly, or makes grinding noise, the motor or capacitor has failed.
Test the pressure switch with a manometer or by jumping. With power off, disconnect one hose from the pressure switch. Blow gently into the port — you should hear a faint click when pressure closes the switch contacts. Use a multimeter to confirm continuity when pressurized. No click and no continuity means the switch has failed.
Inspect the flue pipe. Go outside and check the PVC exhaust and intake terminals at the wall or roof. Clear any debris, ice, or bird nests.
Check for heat exchanger cracks. This requires a combustion analyzer or CO detector. If you smell combustion products in the supply air or the CO detector trips, stop and call a technician immediately.

How to Fix It

Blocked condensate drain — Clear the drain line by flushing with warm water or using a wet-dry vacuum at the termination point. Clean the condensate trap if present. This fix is free and resolves the majority of E2 faults on 90%+ York furnaces.

Cracked or water-filled pressure switch hose — Replace the hose. It is a generic rubber tube available at any hardware store. Cut to length and press onto the barbed fittings. Cost is under $5.

Failed inducer motor — Replace the inducer motor assembly. York parts are widely stocked. The capacitor on the inducer motor is sometimes the failure point and costs far less than the full motor — check it first.

Failed pressure switch — Replace the pressure switch. Match the water column rating stamped on the old switch. Pressure switches are $15–$40 and a straightforward swap.

Blocked flue — Clear the obstruction and restart. If the pipe has cracked or come apart in a wall, repair it before running the furnace.

Parts You May Need

When to Call a Technician

Call a licensed HVAC technician if you cleared the drain and replaced the pressure switch but E2 returns, or if you suspect a cracked heat exchanger. Heat exchanger cracks are a carbon monoxide hazard and cannot be safely diagnosed without proper equipment. A technician can pressure-test the exchanger, run a combustion analysis, and tell you whether the furnace is safe to operate.